Method of making foundry-patterns



(No Model.) l

uAgGARVBY, Y, METHOD 0F MAKING FOUNDRY P RNS. No. 372.793.

Pate Nov. 8, 1887.

UNITED iSTATES PATENT OFFICE.

HENRY A. GARVEY, OF SCRANTON, PENNSYLVANIA.

METHOD oF MAKING -FouNDRY-PATTERNS.

SPECIFICATION forming part of ALetters Patent No. 372,793, dated November 8, 1887.

i Application filed July 20, 1887. Serial No. 244,840. (No model.)

To all whom it may concerner Be it known that I, HENRY A. GARVEY, a citizen of the United States, residing at Scranton, in the county of Lackawanna, State of Pennsylvania, have invented certain new and useful Improvements in Methods of Making Patterns for Foundry Use; and I do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

Heretofore patterns when made in block form or carved have been brought to the desired thickness and finished-on the cope surface by carving done on the reverse or cope side, aided by the constant use of calipers, a very tedious and costly process.

The object of my invention is to make this class of patterns with an accurate reverse or cope surface, and of any desired and uniform thickness, at a great saving-of time and a nominal cost.

The accompanying drawing shows the-dif ferent steps of my improved process for obtaining the cope surface of a pattern.

To carry my invention into effect I take an impression or matrix, B, of plaster-of-parisI from the pattern A to be treated. I then attach to said matrix in several places indicators b, of wood, about a quarter of an inch square, and of the thickness required. I then pour into the matrix a solution composed of eight parts of washed clay and two parts of fluid plaster-ofparis from which the set has been remo ved. After the solution is shaken over all the surface needed, it is emptied from the matrix, and is again poured in after the moisture has been absorbed. This process is repeated until the deposit O shows iiush with the indicators b. The deposit is then removed from the border of the matrix with a steel buffer, and an impression, D, is taken from the clay surface and border of the matrix. The impression D is is now opened and the adhering deposit removed from the matrix and impression by pouncing7 with clay of modeling consistency. The edges needing re-enforcement are chiseled with an angle-tool of requisite draft.7 Flanges, nilos,7 and lugs aresunk, andin the matrix B pouring-gates7 and air-vents are cut. The matrix B and impression D are then placed together and secured against being forced apart. A composition composed of two pounds of rosin, one pound of yellow wax, one pound of red lead, one gill ofolive-oil, one gill of turpentine, and four ounces of powdered French chalk, heated to boiling, is poured into 4 the cavity formed by removal of the deposit.

When cool, the casting thus achieved is cleared from burr and gates and coated on both sides with shellac. This casting, which constitutes the cope-pattern, is now ready for use, and is placed in a sand half-mold, F, formed in the drag from the pattern A.

A striking advantage of my process is that the solution forms a deposit of even thickness rial, the thickness of the series being deter-` mined by the indicating devices, taking from the lined matrix a patrix, removing the lining from the matrix, and ually placing together the matrix and patrix and casting the' pattern between them.

HENRY A. GARVEY. Witnesses:

C. W. RoEsLER, Jr., P. J. KENNY. 

